Smilosuchus gregorii ( Camp, 1930 )
publication ID |
https://doi.org/ 10.1206/352.1 |
persistent identifier |
https://treatment.plazi.org/id/357D771B-FFBA-FFB2-EDC4-FB72FE74FD81 |
treatment provided by |
Tatiana |
scientific name |
Smilosuchus gregorii ( Camp, 1930 ) |
status |
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Smilosuchus gregorii ( Camp, 1930) , sensu Long and Murry, 1995 ( fig. 7J) (5 Machaeroprosopus gregorii Camp, 1930 )
AGE: Early-mid Norian, Late Triassic ( Irmis and Mundil, 2008).
OCCURRENCE: Blue Mesa Member of the Chinle Formation, Arizona.
HOLOTYPE: UCMP 27200, complete skull with mandible, eight vertebrae, a femur and osteoderms.
REFERRED MATERIAL: USNM 18313, partial skull, complete mandible, and nearly complete postcranial skeleton; AMNH FR 3060, skull, mandible, pelvis, osteoderms, partial hind limb.
REMARKS: Smilosuchus represents one of the largest phytosaurs (skull length.1.5 m) recovered from the Chinle Formation. As with most phytosaur specimens, the holotype of Smilosuchus consists of a skull and only fragments of the postcrania. Therefore, I rely on the nearly complete, disarticulated postcranial skeleton with associated skull of USNM 18313 for scoring postcrania. The ankle of USNM 18313 has figured prominently in studies of phytosaur locomotion ( Parrish, 1986) and the origin of the ‘‘crocodile-normal’’ ankle type ( Sereno, 1991a).
KEY REFERENCES: Camp, 1930; Gregory, 1962; Colbert, 1947; Ballew, 1989; Long and Murry, 1995; Stocker, 2008.
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